Fiber Optic Ferrule and A Guide Pin Clamp with Field Changeable Guide Pins

ABSTRACT

A fiber optic ferrule and a guide pin clamp allows for changing guide pins in the field. The guide pin clamp has a forward clamp portion, a rearward clamp portion configured to engage the biasing spring and a guide pin retaining plate. The forward clamp portion and the rearward clamp portion move relative to one another to also move guide pin retaining plate from a first position to a second position to allow for the removal or insertion of guide pins.

REFERENCE TO RELATED CASE

This application claims priority under 35 U.S.C. § 119 (e) toprovisional application No. 62/269,295 filed on Dec. 18, 2015, thecontents of which are hereby incorporated by reference in theirentirety.

BACKGROUND OF THE INVENTION Field of the Invention

Fiber optic connectors, particularly ones having a higher number ofcomponents, like MTP connectors, are assembled with guide pins eitherinstalled or not installed. It is difficult, if not impossible, tochange this configuration once the fiber optic connector is in thefield. Thus, if the installer has two fiber optic connectors of oneconfiguration (male or female) that need to be mated together, theinstaller has a problem because male-to-male and female-to-femalematings are not possible. Guide pins, if used, are attached to a guidepin clamp (or may also be called a guide pin keeper). The guide pinclamp serves a number of functions, including holding the guide pins ina male configuration and centering a spring that biases the fiber opticferrule towards the front end of the fiber optic connector. Since theguide pins are connected to the guide pin clamp and extend through thefiber optic ferrule, they are not easily removed once the fiber opticconnector is completed. In a traditional female configuration, the guidepin clamp may have short extensions that are inserted into the guide pinholes in the fiber optic ferrule to align the pin clamp and the springwith the fiber optic ferrule. However, using such a guide pin clampprevents any attempt to change the fiber optic connector between afemale configuration and a male configuration due to the shortextensions.

When the fiber optic connector is made with the intention of being ableto field-covert the fiber optic connector from one configuration toanother, the ability to align the pin clamp with the fiber optic ferruleis severely compromised, if not totally destroyed. Thus, a fiber opticconnector that allows for the guide pins to be inserted or removed inthe field without removing any of other components of the fiber opticconnector and maintaining alignment with the fiber optic ferrule isneeded.

SUMMARY OF THE INVENTION

The present invention is directed to a pin clamp for use with a fiberoptic connector, the fiber optic connector having at least one housing,a fiber optic ferrule disposed at least partially within the at leastone housing of the fiber optic connector, the fiber optic ferrule havingguide pin openings extending from a front face to a rear face of thefiber optic ferrule to receive a guide pin therein, a spring, and aspring push, the pin clamp that includes a forward clamp portion toengage the rear face of the fiber optic ferrule, the forward clampportion having two guide pin openings therethrough to receive a guidepin in each of the two guide pin openings, a rearward clamp portionconfigured to engage the spring for biasing the fiber optic ferrule inthe fiber optic connector and two guide pin receptacles to receive atleast a portion of one of the guide pins, and a guide pin retainingplate at least partially disposed between the forward clamp portion andthe rearward clamp portion, the guide pin retaining plate configured toengage a portion of each of the guide pins.

In some embodiments, the forward clamp portion has a front face and arear face, at least one rearward tab extending from the rear face andaway from the forward clamp portion to engage a portion of the rearwardclamp portion and at least one sloped surface to engage a tab extendingfrom a front face of the rearward clamp portion.

In some other embodiments, the rearward clamp portion has a front faceand a rear face, the rear face configured to engage the spring forbiasing the fiber optic ferrule, at least one sloped surface on thefront face of the rearward clamp portion to engage the tab extendingfrom the rear face of the forward clamp portion.

In some other embodiments, wherein the forward clamp portion and therearward clamp portion each have two tabs to engage corresponding slopedsurfaces on the other of the forward clamp portion and the rearwardclamp portion.

In another embodiment, one of the clamp portions is moveable between afirst position and a second position, and wherein in the second positionthe guide pin openings in the forward clamp portion and the openings inguide pin retaining plate are aligned with one another.

According to another aspect of the present invention, there is a fiberoptic connector having field-changeable guide pins that includes atleast one housing defining a passageway, a fiber optic ferrule disposedat least partially within the passageway of the at least one housing ofthe fiber optic connector, the fiber optic ferrule having guide pinopenings extending through the fiber optic ferrule from a front face toa rear face thereof to receive a field-changeable guide pin therein, apin clamp comprising a forward clamp portion, a rearward clamp portionand a guide pin retaining plate, wherein the forward clamp portion isconfigured to engage the rear face of the fiber optic ferrule, theforward clamp portion having two guide pin openings therethrough toreceive a field-changeable guide pin in each of the two guide pinopenings, and wherein the rearward clamp portion is configured to engagea spring for biasing the fiber optic ferrule in the fiber opticconnector and has two guide pin cavities to receive at least a portionof one of the field-changeable guide pins, and wherein the guide pinretaining plate is disposed between the forward clamp portion and therearward clamp portion, the guide pin retaining plate configured toengage a portion of each of the guide pins, the spring disposed withinthe at least one housing and rearwardly of the pin clamp; and a springpush engaging the spring and the connector housing to retain the springand fiber optic ferrule within the connector housing.

According to yet another aspect of the present invention, there is a pinclamp for use with a fiber optic connector, the fiber optic connectorhaving at least one housing, a fiber optic ferrule disposed at leastpartially within the at least one housing of the fiber optic connector,the fiber optic ferrule having guide pin openings extending from a frontface to a rear face of the fiber optic ferrule to receive a guide pintherein, a spring, and a spring push, the pin clamp that includes aforward clamp portion to engage the rear face of the fiber opticferrule, the forward clamp portion having two guide pin openingstherethrough to receive a guide pin in each of the two guide pinopenings, a rearward clamp portion configured to engage the spring forbiasing the fiber optic ferrule in the fiber optic connector and twoguide pin receptacles to receive at least a portion of one of the guidepins, and at least one guide pin retaining plate at least partiallydisposed between the forward clamp portion and the rearward clampportion, the forward clamp portion and the rearward clamp portionmovable relative to one another between a first position and a secondposition and the guide pin retaining plate configured to engage aportion of each of the guide pins in the first position.

It is to be understood that both the foregoing general description andthe following detailed description of the present embodiments of theinvention are intended to provide an overview or framework forunderstanding the nature and character of the invention as it isclaimed. The accompanying drawings are included to provide a furtherunderstanding of the invention and are incorporated into and constitutea part of this specification. The drawings illustrate variousembodiments of the invention and, together with the description, serveto explain the principles and operations of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a partial cross sectional view of one embodiment of a fiberoptic connector according to the present invention;

FIG. 2 is a perspective view of one embodiment of a fiber optic ferruleand pin clamp according to the present invention showing the front, top,and right sides thereof;

FIG. 3 is a perspective view of the fiber optic ferrule and pin clamp inFIG. 2 showing the front, bottom, and left sides thereof;

FIG. 4 is a perspective view of the fiber optic ferrule and pin clamp inFIG. 2 showing the rear, bottom, and left sides thereof;

FIG. 5 is a partially exploded view of the fiber optic ferrule and pinclamp of FIG. 2 with the rearward clamp portion and guide pin retainingplate pulled rearwardly;

FIG. 6 is a perspective view from the rear of the fiber optic ferruleand pin clamp of FIG. 5 with the forward clamp portion, the rearwardclamp portion, and the guide pin retaining plate pulled away from thefiber optic ferrule;

FIG. 7 is a perspective view from the front of the fiber optic ferruleand pin clamp of FIG. 5 with the forward clamp portion, the rearwardclamp portion, and the guide pin retaining plate pulled away from thefiber optic ferrule;

FIG. 8 is an exploded view of the forward clamp portion and the rearwardclamp portion of FIG. 4 showing the engagement portions thereof;

FIG. 9 is an exploded view of the forward clamp portion, the rearwardclamp portion, and the guide pin retaining plate engaging the rearwardclamp portion;

FIG. 10 is a plan view of the guide pin retaining plate engaging therearward clamp portion in the first position;

FIG. 11 is a plan view of the guide pin retaining plate engaging therearward clamp portion in the second position;

FIG. 12 is a left side view of the pin clamp prior to engagement by atool used to move one of the forward clamp portion and the rearwardclamp portion relative to one another;

FIG. 13 is a side view of the pin clamp in FIG. 12 with the tool makingcontact with the rearward clamp portion to allow for insertion orremoval of the guide pins;

FIG. 14 is a side view of an alternative embodiment of a pin clampaccording to the present invention with the tool making contact with therearward clamp portion to allow for insertion or removal of the guidepins;

FIG. 15 is a partial cross sectional view of the fiber optic connectoraccording to the present invention with a tool to remove/insert guidepins prior to engagement with the rearward clamp portion and in thefirst position; and

FIG. 16 is a partial cross sectional view of the fiber optic connectorof FIG. 13 with the tool engaging the rearward clamp portion and in thesecond position.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Reference will now be made in detail to the present preferredembodiment(s) of the invention, examples of which are illustrated in theaccompanying drawings. Whenever possible, the same reference numeralswill be used throughout the drawings to refer to the same or like parts.

Referring to FIG. 1, a fiber optic connector 100 according to oneembodiment of the present invention is illustrated. The fiber opticconnector 100 includes a connector inner housing 102 a and outer housing102 b, a fiber optic ferrule 104, a spring 106, a spring push 108, aguide pin clamp 110, and guide pins 112 in guide pin holes 114. As isknown in the art, the fiber optic ferrule 104 is inserted into theconnector housing 102 and it engages a seating surface 116, whichprevents the fiber optic ferrule 104 from traveling too far toward thefront of the connector housing 102. The spring 106 is inserted behindthe guide pin clamp 110, which is behind the fiber optic ferrule 104 tobias the fiber optic ferrule 104 toward the seating surface 116. Aspring push 108 engages the back end of the spring 106 and the connectorhousing 102, securing the fiber optic ferrule 104, a spring 106, thespring push 108, and the guide pin clamp 110 in the connector housing102. When the fiber optic connector 100 engages another fiber opticferrule (not shown), the fiber optic ferrules 104 of the two fiber opticconnectors engage one another, causing the spring 106 to be compressedbetween the guide pin clamp 110 (which engages the rear end of fiberoptic ferrule 104) and the spring push 108. The fiber optic ferrule 104is pushed rearwardly and the fiber optic ferrule 104 is unseated fromthe seating surface 116. As long as the spring 106 squarely engages theback end 118 of the guide pin clamp 110, then the fiber optic ferrule104 can appropriately engage the other fiber optic ferrule. The spring106 is designed to engage the back end 118 of the guide pin clamp 110adjacent the two spring retaining members 120. See also FIG. 4. However,the spring 106 may also engage the back end 116 of the guide pin clamp110 on other surfaces on the back end 118 of the guide pin clamp 110.When the spring 106 contacts only a portion of the guide pin clamp 110,an off-axis moment is created and interferes with the mating of thefiber optic ferrules. More discussion of the off-axis force issues andstructures to be added to a guide pin clamp are discussed in co-pendingapplication Ser. No. 15/137,303, filed on Apr. 25, 2016, the contents ofwhich are incorporated herein in their entirety.

Turning to FIGS. 2-9, one embodiment of a combination of a fiber opticferrule 104 and a guide pin clamp 110 according to the present inventionis illustrated. As is known in the art, a guide pin clamp is installedbehind the fiber optic ferrule to hold the guide pins in the ferrule(for the male version) when the fiber optic connector is mated andunmated with another fiber optic connector. As a result, the guide pinscan not be removed from the fiber optic connector. In the femaleversion, a guide pin clamp typically keeps the spacing correct withinthe fiber optic connector, eliminating the need for different springs tobias the fiber optic ferrule in the connector.

As used herein, the term “front” and “forward” means that directionwhere the fiber optic connector would mate with another fiber opticconnector or device, while the term “rear” or “rearward” is used to meanthe direction from which the optical fibers enter into the fiber opticferrule. So turning to FIG. 2, the front is the direction shown by thearrow and “back” or “rearward” is the opposite direction. Thus, thefront of the fiber optic ferrule 104 is pointed out of the page in FIG.2 and the rear or rearward end of the fiber optic ferrule 104 (and theguide pin clamp) is pointing downward into the paper. Similarly, the topof the fiber optic ferrule is that side that has an opening 122 into thefiber optic ferrule as illustrated in FIG. 2 while the bottom is thelarge surface 138 in FIG. 3.

The fiber optic ferrule 104 has a main body 130 having a front face 132,a rear face 134 (see FIG. 6), a top 136, a bottom 138 (see FIG. 3), twosides 140,142, and a first opening 144 extending from the rear face 134toward the front face 132. The first opening 144 is configured toreceive optical fibers (not shown) which transmit the light through thefiber optic ferrule 104. The fiber optic ferrule 104 also has aplurality of optical fiber openings 146 disposed in the main body 130between the front face 132 and the first opening 144, each of theoptical fiber openings 146 to receive an optical fiber therein (notshown). The rear face 134 also has at least two openings 148 (see FIG.6) extending from the rear face 134 into the main body 130 towards thefront face 132

The guide pin clamp 110 has a forward clamp portion 150 and a rearwardclamp portion 152, the forward clamp portion 150 and the rearward clampportion 152 having a guide pin retaining plate 154 therebetween. Whilethe three components of the guide pin clamp 110 are illustrated as beingindependent elements, they may also be connected or otherwise attachedto one another and still come within the scope of the present invention.Additionally, the guide pin retaining plate 154 may also be divided intotwo portions rather than being a single element.

The forward clamp portion 150 is that portion of the guide pin clamp 110that is closest to and engages the fiber optic ferrule 104. The forwardclamp portion 150 has a front face 160 and a rear face 162. See FIGS. 6& 7. The forward clamp portion 150 has at least two projections 164extending from the front face 160 and away from the forward clampportion 150. The two projections 164 are configured to engage the twoopenings 148 in the rear face 134 of the main body 130. The engagementof the fiber optic ferrule 104 by the forward clamp portion 150 (inconjunction with the other portions of the guide pin clamp 110) alignsthe spring 106 with the fiber optic ferrule 104 for consistent biasingforce as explained above. While two projections 164 are illustrated onthe front face 160, there may also be three, four or more projections toalign the fiber optic ferrule 104 and the forward clamp portion 150. Theprojections 164 may also be of different sizes (e.g., smaller or larger)and may also be of a different shape (e.g., oval, square, rectangle,etc.). The forward clamp portion 150 may also be aligned with the fiberoptic ferrule 104 by the connector inner housing 102 a or by structureson the connector inner housing 102 a. As illustrated, the forward clampportion 150 is generally u-shaped (as are all of the components 150,152, 154 of the guide pin clamp 110) to allow optical fibers to passthrough the guide pin clamp 110 and into the fiber optic ferrule 104.This configuration also allows for the components of the guide pin clamp110 to be added after the fiber optic ferrule 104 is installed on theoptical fibers if necessary. The forward clamp portion 150 also has twoguide pin openings 166 extending through the forward clamp portion 150to receive the guide pins 112. However, the forward clamp portion 150need not have separate guide pin openings 166 but the guide pins couldpass through the u-shaped portion (even if it were an extended portion).

On the rear face 162 of the forward clamp portion 150 are two extensions168 a, 168 b that extend away from the rear face 162 and the forwardclamp portion 150 in a rearward direction to cooperate with the rearwardclamp portion 152 during the relative movement of the forward clampportion 150 and the rearward clamp portion 152, as explained in furtherdetail below. The two extensions 168 a, 168 b are disposed on oppositecorners of the forward clamp portion 150.

The forward clamp portion 150 also includes two helical ramp surfaces170 a and 170 b that cooperate with a portion of the rearward clampportion 152 during insertion or removal of the guide pins 112. See FIG.8. Adjacent to the extensions 168 a, 168 b (i.e., on the same corners ofthe forward ramp portion 150 as the extensions 168) are tabs 172 a, 172b that engage corresponding ramp surfaces on the rearward clamp portion152.

The rearward clamp portion 152 provides a dual function-it is acomponent of the guide pin clamp 110 and provides a structure forengaging the spring 106. The rearward clamp portion 152 has a front face180 and a rear facing portion 182. The front face 180 has two slots orcavities 184 that correspond to the two extensions 168 that extend awayfrom the rear face 162 of the forward clamping portion 150. When the twoextensions 168 a, 168 b that extend away from the rear face 162 aredisposed within the two openings 184, the two clamp portions cooperatewith one another to move the guide pin retaining plate 154 so that theguide pins 112 may be inserted or removed from the fiber opticconnector.

The rearward clamp portion 152 also includes two openings or cavities186 to receive the ends of the guide pins 112 therein. The openings 186are illustrated best in FIGS. 7 & 8 as being more of a u-shaped voidthan as a circular hole like those illustrated as openings 166. Itshould be noted that the guide pins 112 do not need to engage therearward clamp portion 152, as the guide pins 112 are secured to the pinclamp 110 by the guide pin retaining plate 154 as discussed in moredetail below.

The rearward clamp portion 152 also has two tabs 188 a, 188 b extendingfrom the front face 180 and away from the rearward clamp portion 152.Thus, tabs 188 a, 188 b extend toward the forward clamp portion 150 toengage the two helical ramp surfaces 170 a and 170 b, respectively. Therearward clamp portion 152 similarly has two helical ramp surfaces 190 aand 190 b that engage tabs 172 a, 172 b on the front clamp portion 150.The combination of the tabs (tabs 172 a, 172 b, 188 a, 188 b) with thehelical ramp surfaces (170 a, 170 b, 190 a, and 190 b) acts as a camwhen one of the forward clamp portion 150 and the rearward clamp portion152 is rotated relative to the other.

To retain the guide pin retaining plate 154 between the forward and therearward clamp portions, the rearward clamp portion 152 has on its frontface 180 at least one guide pin retaining plate projection 192. Asillustrated in FIG. 8, there may two such guide pin retaining plateprojections 192. As would be known to one of skill in the art, while twoseparate projections are illustrated, they could also be connected toone another to capture a portion of the guide pin retaining plate 154.Another structure on the rearward clamp portion 152 is a guide pinretaining plate tab 194. The guide pin retaining plate tabs 194 extendfrom the front face 180 adjacent the guide pin cavities 186. At the endof the guide pin retaining plate tabs 194 is a rearward facing surface196.

The rear facing portion 182 of the rearward clamp portion 152 isconfigured to engage the spring 106 for biasing the fiber optic ferrule104 towards the front of the fiber optic connector 100. The rearwardclamp portion 152 has the two spring retaining members 120 that have aninside surface 124 that is preferably shaped to retain the spring 106.

The guide pin retaining plate 154 is, as best illustrated in FIGS. 5-7and 9, disposed between the forward clamp portion 150 and the rearwardclamp portion 152. The guide pin retaining plate 154 has two partiallycircular portions 200 joined by an elongated member 202. Each ofpartially circular portions 200 form an opening 204 to allow a portionof each of the guide pins 112 to pass therethrough and into the guidepin cavities 186 in the rearward clamp portion 152.

Turning now to FIG. 9, the guide pin retaining plate 154 is disposed onthe rearward clamp portion 152 with the elongated member 202 passingbetween the two guide pin retaining plate projections 192. At the sametime, the two partially circular portions 200 are disposed between thefront face 180 of the rearward clamp portion 152 and the rearward facingsurface 196 of the guide pin retaining plate tabs 194. The guide pinretaining plate 154 will now move with the rearward clamp portion 152.It should be noted that there is sufficient spacing (gaps) between thestructures (guide pin retaining plate projections 192 and the front face180 of the rearward clamp portion 152) holding the guide pin retainingplate 154 so that the guide pin retaining plate 154 may move (slightly)relative to the rearward clamp portion 152.

It should be noted that the pieces (150, 152, and 154) of the guide pinclamp 110 are biased together due to the spring 106 exerting force onthe rearward clamp portion 154 on the one side and the fiber opticferrule 104 providing a stop for the guide pin clamp 110 on the otherside.

FIGS. 10 & 11 illustrate the operation of the guide pin clamp 110. Whenone of the forward clamp portion 150 and the rearward clamp portion 152is rotated relative to the other, the guide pin retaining plate 154moves with the portion that is moved. So, as illustrated in the FIGS. 10and 11, the rearward clamp portion 152 is rotated using a tool 210(which as illustrated may be a guide pin or specialized tool) that ispushed on one side at the top of the rearward clamp portion 152 and atthe same time on the bottom of the rearward clamp portion 152 on theother side. See, e.g., FIGS. 6-7, 10-11, and 15-16. There may beindentations 212 to receive an end of the tool 210. Without the tool 210providing force on the rearward clamp portion 152, the pin clamp 100 isin the first position and the guide pin retaining plate 154 engages aportion of the guide pins. See FIG. 10. The spring 106 exerts a force onthe rearward clamp portion 152, and together with the tabs (172 a, 172b, 188 a, 188 b) and the helical ramp surfaces (170 a, 170 b, 190 a, and190 b), the rearward clamp portion 152 remains in the first position. Inthis position, the guide pin retaining plate 154 engages a cut-out orreduced radius portion of the guide pins (if the are inserted into thefiber optic ferrule 104). Preferably, the forward clamp portion 150 andthe rearward clamp portion 152 are also aligned with one another. Whenthe tool 210 is used (as in FIG. 11), the downward force on one side andthe upward force on the other side of the rearward clamp portion 152causes the rearward clamp portion 152 to move, and in this case rotatein a clockwise direction, relative to the forward clamp portion 150.Since the guide pin retaining plate 154 is engaged with the rearwardclamp portion 152, the guide pin retaining plate 154 rotates with therearward clamp portion 152. See FIG. 11. This motion causes the openings204 to align with the guide pins 112, the openings in the fiber opticferrule 104, and the forward clamp portion 150, thereby releasing aguide pin 112 that may be removed. If the operator is attempting tochange the orientation from a female connector to a male connector, thenthe motion of rearward clamp portion 152 allows for guide pins 112 to beinserted into the fiber optic connector 100. After insertion of theguide pins, the tool 210 is removed and the rearward clamp portion 152and the guide pin retaining plate 154 rotate in a counterclockwisedirection back to the first position due to the force of the spring 106.

It is also possible to change the gender from female to male by simplypushing the guide pins 112 into the fiber optic ferrule 104. Theradiused back end of the guide pins 112 will engage the guide pinretaining plate 154 and cause it and the rearward clamp portion 152 torotate sufficiently to allow the guide pins 112 to be inserted. The biason the pin clamp 100 will cause the guide pin retaining plate 154 andthe rearward clamp portion 152 to rotate back to the first position,engaging the guide pins 112.

The movement of the rearward clamp portion 152 relative to the forwardclamp portion 150 is a result of the tabs (172 a, 172 b, 188 a, 188 b)and the helical ramp surfaces (170 a, 170 b, 190 a, and 190 b)interacting with one another. Turning to FIG. 12, the pin clamp 110 isin the first position, which is the position that the pin clamp is mostof the time. At the bottom of the pin clamp, the tab 188 b is visiblebeing disposed at the helical ramp surface 170 b. In FIG. 13, force isbeing applied to the rearward clamp portion 152 and the top of therearward clamp portion 152 is being rotated into the page—causing thetab 188 b to move up the helical ramp surface 170 b. This causes therearward clamp portion 152 to move a bit rearwardly (to the left in thefigure) allowing the guide pin retaining plate 154 to rotate freely withthe rearward clamp portion 152, which has been pushed away from theforward clamp portion as a result of the profile of the helical rampsurfaces (170 a, 170 b, 190 a, and 190 b). The ramp surfaces, whilebeing disclosed as having a helical profile, could have other profilesas well. For example, FIG. 14 illustrates an alternative embodiment ofpin clamp 110′ with a more linear profile for the ramp surface 170 b′.

FIG. 15 illustrates the fiber optic connector 100 with the pin clamp 110in the first position—that is, the tool 210 not yet exerting a force onthe rearward clamp portion 152. The inner housing 102 a has two openings220 (one on top of fiber optic connector 100 is illustrated—same on theopposite bottom side) that receives the tool 210 adjacent to therearward clamp portion 152. FIG. 16 illustrates the movement of therearward clamp portion 152 relative to the forward clamp portion 152.Thus, FIGS. 15 and 16 correspond to FIGS. 12 and 13.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the present inventionwithout departing from the spirit and scope of the invention. Thus it isintended that the present invention cover the modifications andvariations of this invention provided they come within the scope of theappended claims and their equivalents.

1-12. (canceled)
 13. A fiber optic connector having field-changeableguide pins, comprising: at least one housing defining a passageway; afiber optic ferrule disposed at least partially within the passageway ofthe at least one housing of the fiber optic connector, the fiber opticferrule having guide pin openings extending through the fiber opticferrule from a front face to a rear face thereof to receive afield-changeable guide pin therein; a pin clamp comprising a forwardclamp portion, a rearward clamp portion and a guide pin retaining plate,wherein the forward clamp portion is configured to engage the rear faceof the fiber optic ferrule, the forward clamp portion having two guidepin openings therethrough to receive a field-changeable guide pin ineach of the two guide pin openings, and wherein the rearward clampportion is configured to engage a spring for biasing the fiber opticferrule in the fiber optic connector and has two guide pin cavities toreceive at least a portion of one of the field-changeable guide pins,and wherein the guide pin retaining plate is disposed between theforward clamp portion and the rearward clamp portion, the guide pinretaining plate configured to engage a portion of each of the guidepins; the spring disposed within the at least one housing and rearwardlyof the pin clamp; and a spring push engaging the spring and theconnector housing to retain the spring and fiber optic ferrule withinthe connector housing.
 14. The fiber optic connector according to claim13, wherein the forward clamp portion has a front face and a rear face,the at least one projection extending from the front face and away fromthe forward clamp portion, at least one rearward tab extending from therear face and away from the forward clamp portion to engage a portion ofthe rearward clamp portion, and at least one sloped surface to engage atab extending from a front face of the rearward clamp portion, andwherein the rearward clamp portion has a front face and a rear face, therear face configured to engage the spring for biasing the fiber opticferrule, at least one sloped surface on the front face of the rearwardclamp portion to engage the tab extending from the rear face of theforward clamp portion. 15-18. (canceled)
 19. A pin clamp for use with afiber optic connector, the fiber optic connector having at least onehousing, a fiber optic ferrule disposed at least partially within the atleast one housing of the fiber optic connector, the fiber optic ferrulehaving guide pin openings extending from a front face to a rear face ofthe fiber optic ferrule to receive a guide pin therein, a spring, and aspring push, the pin clamp comprising: a forward clamp portion to engagethe rear face of the fiber optic ferrule, the forward clamp portionhaving two guide pin openings therethrough to receive a guide pin ineach of the two guide pin openings; a rearward clamp portion configuredto engage the spring for biasing the fiber optic ferrule in the fiberoptic connector and two guide pin receptacles to receive at least aportion of one of the guide pins; and at least one guide pin retainingplate at least partially disposed between the forward clamp portion andthe rearward clamp portion, the forward clamp portion and the rearwardclamp portion movable relative to one another between a first positionand a second position and the guide pin retaining plate configured toengage a portion of each of the guide pins in the first position. 20.The pin clamp according to claim 19, wherein the forward clamp portionand the rearward clamp portion are rotatable relative to one anotherabout an axis longitudinally oriented relative to the fiber opticferrule.
 21. The pin clamp according to claim 19, wherein the springbiases the rearward clamp portion into the first position.
 22. The pinclamp according to claim 19, wherein the guide pin retaining plate isconfigured to disengage the guide pins in the second portion.
 23. Thepin clamp according to claim 19, wherein the forward clamp portion andthe rearward clamp portion each have a helical ramp, the forward clampportion and the rearward clamp portion being movable along respectivehelical ramps of each other.
 24. The pin clamp according to claim 19,further comprising a fiber optic connector having at least one housing,a fiber optic ferrule disposed at least partially within the at leastone housing of the fiber optic connector, the fiber optic ferrule havingguide pin openings extending from a front face to a rear face of thefiber optic ferrule to receive a guide pin therein, a spring, and aspring push.
 25. The pin clamp according to claim 19, wherein theforward clamp portion has a front face and a rear face, at least onerearward tab extending from the rear face and away from the forwardclamp portion to engage a portion of the rearward clamp portion and atleast one sloped surface to engage a tab extending from a front face ofthe rearward clamp portion.
 26. The pin clamp according to claim 25,wherein the rearward clamp portion has a front face and a rear face, therear face configured to engage the spring for biasing the fiber opticferrule, at least one sloped surface on the front face of the rearwardclamp portion to engage the tab extending from the rear face of theforward clamp portion.
 27. The pin clamp according to claim 26, whereinthe forward clamp portion and the rearward clamp portion each have twotabs to engage corresponding sloped surfaces on the other of the forwardclamp portion and the rearward clamp portion.
 28. The pin clampaccording to claim 19, wherein guide pin retaining plate has twopartially circular portions joined by an elongated member, the partiallycircular portions forming an opening to allow a portion of each of theguide pins to pass therethrough and into the guide pin cavities in therearward clamp portion.
 29. The pin clamp according to claim 28, whereinthe front face of the rearward clamp portion has at least one guide pinretaining plate projection and two guide pin retaining plate tabs, eachof guide pin retaining plate tabs having a rearward facing surface, theguide pin retaining plate being disposed between the front face of therearward clamp portion and the rearward facing surface of the guide pinretaining plate tabs.
 30. The pin clamp according to claim 29, whereinthe at least one guide pin retaining plate projection comprises twoguide pin retaining plate projections, the elongated member of the guidepin retaining plate passing between the two guide pin retaining plateprojections.
 31. The pin clamp according to claim 28, wherein therearward clamp portion is moveable between a first position and a secondposition, and wherein in the second position the guide pin openings inthe forward clamp portion and the openings in guide pin retaining plateare aligned with one another.
 32. The pin clamp according to claim 31,wherein the guide pin retaining plate moves between the first and secondposition with the rearward clamp portion.
 33. The pin clamp according toclaim 19, wherein a portion of the fiber optic connector allows accessto the rearward clamp portion from outside the fiber optic connector.34. The pin clamp according to claim 19, wherein the forward clampportion has at least one projection configured to engage a correspondingopening in the rear face of the fiber optic ferrule, the at least oneprojection extending from the front face and away from the forward clampportion.